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Motorola GP350 Service Manual
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Motorola GP350 Service Manual

146-174 mhz/438-470 mhz
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GP350
Portable Radios
146-174 MHz
438-470 MHz
6880904Z07-O

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Summary of Contents for Motorola GP350

  • Page 1 GP350 Portable Radios 146-174 MHz 438-470 MHz 6880904Z07-O...
  • Page 2 *6880904Z07* *6880904Z07* Motorola Radius Division Hwy 34 West 6880904Z07-O Mt. Pleasant, IA 52641...

  • Page 3: Computer Software Copyrights

    Accordingly, any copyrighted Motorola computer pro- grams contained in the Motorola products described in this manual may not be copied or reproduced in any manner without the express written per- mission of Motorola.

  • Page 4: Table Of Contents

    Table of Contents Scope of Manual ............. . v How to Use This Manual .
  • Page 5 GP350 Portable Radio Functional Block Diagram ........

  • Page 6: Section

    Parts List: GP350 Basic Mechanical ........
  • Page 7 GP350 Portable Radios Service Manual 6880904Z07-O August, 1996...

  • Page 8: Scope Of Manual

    Scope of Manual chassis or kit which contains the part, and a detailed descrip- tion of the desired component. If a Motorola part number is identified on a parts list, you should be able to order the part This manual is intended for use by experienced technicians through Motorola Parts.

  • Page 9: Model Charts

    Foreword GP350 Portable Radios Service Manual Model Charts Model Charts GP350 146 - 174 MHz X = Indicates one of each required Item Description HHN9126_ Housing HLD9440_ RF Board, 2-Chan., 20/25 kHz, (146-174 MHz) HLD9441_ RF Board, 16-Chan., 20/25 kHz, (146-174 MHz) HLN8255_ Spring-Action Belt Clip, 3”...
  • Page 10 GP350 Portable Radios Service Manual Foreword Model Charts GP350 438 - 470 MHz X = Indicates one of each required Item Description HHN9126_ Housing HLE9480_ RF Board, 2-Chan., 20/25 kHz (438-470 MHz) HLE9481_ RF Board, 16-Chan., 20/25KHz, (438-470 MHz) HLN8255_ Spring-Action Belt Clip, 3”...
  • Page 11 Foreword GP350 Portable Radios Service Manual Model Charts GP350 465 - 495 MHz 490 - 520 MHz X = Indicates one of each required This page has been intentionally left blank. Item Description HLE9487_ RF Board, 12.5 kHz, (465-495 MHz)

  • Page 12: Accessories

    GP350 Portable Radios Service Manual Foreword Accessories Accessories Antennas: NAD6502_R — Black 146-174 MHz VHF Antenna (Standard w/Unit) HAD9742 — Black 146-162 MHz VHF Stubby Antenna HAD9743 — Blue 162-174 MHz VHF Stubby Antenna NAE6483_R — None 403-520 MHz UHF Antenna (Standard w/Unit) NAE6521_R —...
  • Page 13 BNC - RF Adapter (for use with P110, GP300 and GP350 models only) HLN9482 GP300 to GP350 Accessory Adapter Prices And Availability Subject To Change Without Notice * Accessories marked with an asterisk (*) require the HLN9482 (GP300 to GP350 Adapter Kit) for use on GP350 radios. 6880904Z07-O August, 1996...

  • Page 14: Performance Specifications

    GP350 Portable Radios Service Manual Foreword Performance Specifications Performance Specifications GENERAL Model Series: P93MGC P94MGC Frequency: 146-174 438-470 Channel Capacity: 2 or 16 channels 2 or 16 channels Power Supply: One (1) rechargeable Nickel-Cadmium battery (7.5V) Dimensions†: 5.54” X 2.48” X 1.79” (142 X 63X 45.6mm)†...

  • Page 15: Service Aids

    Connects radio to RTX4005B Test Box. REX1143 Programming Adapter Kit Connects radio to programmer (HKN9857) Test Equipment The following table lists test equipment required to service the GP350 and other two-way radios. Motorola Model No. Description Characteristics Application R2200, R2400, or R2001D...

  • Page 16: Test Set Service Cable

    Radio Model Information The model number, serial number, and Motorola FCC designation number are all on a label attached to the back of your radio. From this model number, you can determine the RF output power, frequency band, type of squelch, and number of channels. The table below outlines one portable radio model number and its specific characteristics.

  • Page 17: Radio Service Software Information

    Foreword GP350 Portable Radios Service Manual Radio Service Software Information Radio Service Software Information To run the Radio Service Software, you will need the following equipment: Required Equipment: IBM XT, AT, Convertible, or System/2 Model 30/50 with 512K RAM, Dual Floppy Disk Drives or on Floppy Disk and one Hard Disk.

  • Page 18: Safety Information

    GP350 radios. Hereafter, the text will refer collectively to lated equipment. Motorola subscribes to the same safety the GP350 radios as “this family of radios.” For operation of standards for the use of its products. Proper operation of this the radio, refer to the applicable manual available separately.
  • Page 19 Safety Information GP350 Portable Radios Service Manual FCC Safety Information This page has been intentionally left blank. 6880904Z07-O August, 1996...

  • Page 20: Intrinsically Safe Radio Information

    flammable material exist (hazardous atmosphere) is advised to become familiar with the subject Radios must ship from the Motorola manufacturing facility of intrinsic safety and with the National Electric Code NFPA with the hazardous atmosphere capability and FM Approval 70 (National Fire Protection Association) Article 500 (haz- labeling.

  • Page 21: Repair

    FMRC Approved model. Do Not Substitute Options or Accessories The communications equipment package that Motorola sub- mits to FMRC for testing and approval is tested as a system that consists of the communications unit itself and the bat- tery, antenna and other options or accessories that make up the rest of the package to be approved.

  • Page 22: Disassembly/Reassembly

    Section 3 Disassembly/Reassembly Remove Battery 1. Locate the battery latch on the bottom of the radio. Push the battery latch toward the front of the radio and hold it in the open position as shown in Figure 3-1. Figure 3-1. MAEPF-25233-O 2.

  • Page 23: Remove The Main Board

    Disassembly/Reassembly GP350 Portable Radio Service Manual Remove the Main Board After all four chassis clips have been removed, separate the main board from the chassis as shown in the exploded view Figure 3-7. Flex Cable Figure 3-5. MAEPF-25237-O Pull the chassis out and away from the housing as shown by the arrow in Figure 3-5.

  • Page 24: Theory Of Operation

    Receiver This section provides a detailed theory of operation for the The receiver of the GP350 UHF and VHF radios consists of GP350 and its components: the microcomputer, the receiver, 4 major blocks each: the front-end module, the double bal- the transmitter, and the frequency generation circuitry.

  • Page 25: Intermediate Frequency (If)

    VHF and 3.5 db for UHF. The filter is designed to be termi- nated with the amplifier output impedance on one side, and The GP350 VHF and UHF transmitters contain five basic cir- 50 ohm on the other. cuits: a power amplifier, an antenna switch, a harmonic filter, an antenna matching network, and a power control Refer to The net gain from the receiver module is about (12.2 db...

  • Page 26: Frequency Generation Circuitry

    GP350 Portable Radios Service Manual Theory of Operation Frequency Generation Circuitry to minimize the error produced at the emitter of Q156 result- nally the audio is digitized by the Fractional-N and applied ing from the voltage offset at the input of U151A.

  • Page 27: Tx Audio Path

    P1 provides interconnection of “front cover” option PC tor of Q408 and monitored by U401-14. When the collector boards to the GP350 radio main board. MIC audio output is voltage is “high” (5 volts), the microcontroller configures the available from P1-5 at a level of 45 mVrms and 10k ohm out- radio for transmit mode.

  • Page 28: Limiter (Audio Filter Ic)

    P1 provides interconnection of “front cover” option pc entering transmit mode. U402-19 and U402-20 deviation boards to the GP350 radio main board. Filtered “flat” RX attenuator outputs are combined through resistors R478 and audio output is available at P1-7, at a level of 765 mVrms at...

  • Page 29: Rx Audio Mute Gate

    Option RX audio input R442, R443, R444, R445, and R491, capacitor C423, recti- to the GP350 radio is available at P1-6, with a sensitivity of fier diode CR404 and U406B form a linear peak detector cir- 100 mVrms at less than 200 ohm output impedance from cuit.

  • Page 30: Gp350 Portable Radio Functional Block Diagram

    INSERT PAGE SIZE AND RADIO BLOCK DIAGRAM FROM MANUAL 6880902Z30-D, PAGE 2-7 GP350 Portable Radio Functional Block Diagram August, 1996 6880904Z07-O...

  • Page 31: Receiver, Transmitter, Vco, Synthesizer, And Afic Block Diagrams

    INSERT PAGE SIZE, RECEIVER BLOCK DIAGRAM, TRANSMITTER BLOCK DIAGRAM, VCO BLOCK DIAGRAM, SYNTHESIZER BLOCK DIIAGRAM, AND AFIC BLOCK DIAGRAM FOR MANUAL 6880902Z30-D, PAGE 2-8 Receiver, Transmitter, VCO, Synthesizer, and AFIC Block Diagrams 6880904Z07-O August, 1996...

  • Page 32: Troubleshooting

    Section 5 Troubleshooting Overview This section contains three troubleshooting tables for the following GP350 components: • Receiver • Transmitter • Synthesizer • Microprocessor • Voltage Controlled Oscillator (VCO) Troubleshooting Charts Refer to following pages. August, 1996 6880904Z07-O...

  • Page 33: Troubleshooting Flow Chart For Receiver

    INSERT LINE ART FROM MANUAL 6880902Z30-D, PAGE 4-3 Troubleshooting Flow Chart for Receiver 6880904Z07-O August, 1996...

  • Page 34: Troubleshooting Flow Chart For Transmitter

    INSERT LINE ART FROM MANUAL 6880902Z30-D, PAGE 4-4 Troubleshooting Flow Chart for Transmitter August, 1996 6880904Z07-O...

  • Page 35: Troubleshooting Flow Chart For Synthesizer

    INSERT LINE ART FROM MANUAL 6880902Z30-D, PAGE 4-5 Troubleshooting Flow Chart for Synthesizer 6880904Z07-O August, 1996...

  • Page 36: Troubleshooting Flow Chart For Microprocessor

    INSERT LINE ART FROM MANUAL 6880902Z30-D, PAGE 4-6 Troubleshooting Flow Chart for Microprocessor August, 1996 6880904Z07-O...

  • Page 37: Troubleshooting Flow Chart For Vco

    INSERT LINE ART FROM MANUAL 6880902Z30-D, PAGE 4-7 Troubleshooting Flow Chart for VCO 6880904Z07-O August, 1996...

  • Page 38: General

    63A81084C55-O SPKR SPKR COM 2 10. Same as note 8, except with volume control adjusted for 500 milliwatts (2.82 volts RMS across a 16- REFERENCE MOTOROLA DESCRIPTION ohm load connected to the external speaker jack. SYMBOL PART NO. GND 3 11.

  • Page 39: Component Location Diagram For Hld9440A And Hld9441A Vhf, 146-174Mhz, Transceiver And Controller

    MAEPF-25481-O Component Location Diagram for HLD9440A and HLD9441A VHF, 146-174MHz, Transceiver and Controller MAEPF-25482-O 6880904Z07-O August 13, 1996...

  • Page 40: Schematic Diagram For Hld9440A And Hld9441A Vhf, 146-174Mhz, Transceiver Section

    Schematic Diagram for HLD9440A and HLD9441A VHF, 146-174MHz, Transceiver Section August 13, 1996 6880904Z07-O...

  • Page 41: Component Location Diagram For Hle9480A And Hle9481A

    MAEPF-25483-O Component Location Diagram for HLE9480A and HLE9481A MAEPF-25484-O UHF, 438-470MHz, Transceiver Section 6880904Z07-O August 13, 1996...

  • Page 42: Uhf, 438-470Mhz, Transceiver Section

    Schematic Diagram for HLE9480A and HLE9481A UHF, 438-470MHz, Transceiver Section August 13, 1996 6880904Z07-O...

  • Page 43: Schematic Diagram For Controller Section

    Schematic Diagram for Controller Section 6880904Z07-O August 13, 1996...

  • Page 44: Parts List: Controller Components (For All Bandsplits)

    NOTE: For optimum performance, order replacement diodes, transistors, and C436 2113740A71 470pF L401 2460578C43 R462 0660076B17 470k integrated circuits by Motorola part number only. When ordering crystal units, C437 2113741A59 39nF specify type number, frequency, and Motorola part number. L403 thru L406 2462587Q42 390nH R463...

  • Page 45: Parts List: Hld9440A And Hld9441A, 146-174Mhz Vhf Transceiver

    NOTE: For optimum performance, order replacement diodes, transistors, and C202, C203 2113741A45 10nF C280 2113740A79 L267 2462587X56 180nH R173 integrated circuits by Motorola part number only. When ordering crystal units, C56 thru C58 2113740A36 20pF C204 2311049J27 10uF C281 2113740A71 470pF...

  • Page 46: Parts List: Hle9480A And Hle9481A, 438-470Mhz Uhf Transceiver

    C282 2113740A71 470pF L261 2462587X47 33nH R171 0660076A90 NOTE: For optimum performance, order replacement diodes, transistors, and 2113741A25 1.5nF integrated circuits by Motorola part number only. When ordering crystal units, C205 2113740A63 220pF C283 2113740A59 150pF L262 2462587X43 15nH R172...

  • Page 47: Parts List: Gp350 Basic Mechanical

    Parts List: GP350 Basic Mechanical REFERENCE MOTOROLA DESCRIPTION SYMBOL PART NO. HLN8255 CLIP, Spring Belt HNN9360 BATTERY (Also see Accessories) HNN9361 BATTERY, FM 13-80463E01 ESCUTCHEON, Battery Contact 39-80571E01 CONTACT, Programming 39-80457E01 CONTACT, Battery 32-80545C01 GASKET, Chassis 01-80708Y67 CHASSIS 18-80143S02 POTENTIOMETER, Volume 42-80190R04 CLIP, Locking;...

  • Page 48: Hln9960A Dtmf Circuit Board Detail

    INSERT PAGE SIZE, ARTWORK, AND TEXT FROM MANUAL: 6880902Z30-D, PAGE 51 HLN9960A DTMF Circuit Board Detail August 13, 1996 6880904Z07-O 6-11...

  • Page 49: Hln9960A Dtmf Schematic Diagram And Parts List

    INSERT PAGE SIZE, ARTWORK, AND TEXT FROM MANUAL: 6880902Z30-D, PAGE 52 HLN9960A DTMF Schematic Diagram and Parts List 6-12 6880904Z07-O August 13, 1996...

  • Page 50: Battery Chargers Single And Multi-Unit Rapid Rate (1 Hour)

    GP300 / GP350 / P110 Chargers & Power Supplies Battery Charger Rate/Voltage Power Supply HTN9630 1 Hour / 120 V 25-80162R01 HTN9702 10 Hour / 120 V 25-80955Z02 HTN9748 (6 unit) 1 Hour / 120 V 25-80427B01 HTN9938 (6 unit)
  • Page 51 INSERT PAGE SIZE, ARTWORK, AND TEXT FROM MANUAL: 6880902Z30-D, PAGE 54 Battery Chargers Single and Multi-Unit Rapid Rate (1 Hour) 6-14 6880904Z07-O August 13, 1996...

  • Page 52: Battery Chargers Standard Rate (10 Hour)

    INSERT PAGE SIZE, ARTWORK, AND TEXT FROM MANUAL: 6880902Z30-D, PAGE 55 Battery Chargers Standard Rate (10 Hour) August 13, 1996 6880904Z07-O 6-15...
  • Page 53 INSERT PAGE SIZE, ARTWORK, AND TEXT FROM MANUAL: 6880902Z30-D, PAGE 56 Battery Chargers Standard Rate (10 Hour) 6-16 6880904Z07-O August 13, 1996...

  • Page 54: Schematic Diagram And Parts List For Hmn9041A Remote Speaker/Microphone

    Pin #4 (Blue) Pin #5 (None) Pin #1 (Red) Pin #3 (Black) Parts List: HMN9041A Remote Speaker/Microphone REFERENCE MOTOROLA SYMBOL PART NO. DESCRIPTION CAPACITOR, Fixed: uF +/-10%; 100V; unless otherwise stated 2113740A53 82pF, +/-5%, 50V 2113740A67 330pF, +/-5%, 50V 2113741A53 .022uF, +/-5%, 50V...

  • Page 55: Exploded View And Parts List For Hmn9041A Remote Speaker/Microphone

    Parts List: HMN9041A Remote Speaker/Microphone REFERENCE MOTOROLA SYMBOL PART NO. DESCRIPTION 0105953N42 Front housing, items 1 thru 5 3305259Q01 Nameplate, Motorola 4505182Q01 Lever, PTT 3501152J01 Grille, cloth 1105461R01 Adhesive 0180492E01 Acc. Conn. Cable Assembly 0180703Y67 PCB: includes electrical parts 3905834K06...

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